Plugin w=for shipping company

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I hope you are doing well.

I would like to ask you if you have any idea about how can i create a plugin using liquid tempting language .

The idea is i need to create a plugin which mean i need to create a public app to allow the merchants to add our shipping company as a shipping services and once the customer added his items he should choose our company as shipping company and we need to link it to out exiting API in order to create a waybill number to him .

i created the public app but how can use it to write the code using liquid.